Olahair AD Shampoo is used to control dandruff and gives relief from scaly, flaky, and itchy scalp. It is an antifungal and works by killing and stopping the growth of fungus that causes dandruff. Massage it on your scalp and leave it on for a few minutes before rinsing it off. Make sure you complete the full course of treatment. This will ensure that the infection is completely cured and prevent it from returning.